37. A wheel has a radius of 0.4 m and rotates at an angular velocity of 4 rad/s. A peg at the edge of the wheel is at the heighted point at t = 0. What is the period of the motion of the shadow? (A) 1.51 s (B) 1.57 s (C) 2.05 s (D) 2.36 s (E) 3.14 s